[PATCH] gfs2: add missing __rcu annotation to i_gl in incore.h

[Adrian Garcia Casado <adriangarciacasado42@gmail.com>]

In gfs2_inode_lookup() and other parts of the GFS2 filesystem,
ip->i_gl is accessed and dereferenced via RCU helpers like
rcu_dereference_check() and rcu_access_pointer(). However, the
actual i_gl pointer in struct gfs2_inode was never annotated
with __rcu in incore.h.

This missing annotation causes Sparse to throw multiple
"incompatible types in comparison expression (different address spaces)"
warnings and compilation-blocking errors under strict static analysis builds.

Fix this by adding the __rcu annotation to i_gl in struct gfs2_inode.

Signed-off-by: Adrian Garcia Casado <adriangarciacasado42@gmail.com>
Tested-by: Adrian Garcia Casado <adriangarciacasado42@gmail.com>
---

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 6146577..16df753 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -392,7 +392,7 @@ struct gfs2_inode {
 	u64 i_generation;
 	u64 i_eattr;
 	unsigned long i_flags;		/* GIF_... */
-	struct gfs2_glock *i_gl;
+	struct gfs2_glock __rcu *i_gl;
 	struct gfs2_holder i_iopen_gh;
 	struct gfs2_qadata *i_qadata; /* quota allocation data */
 	struct gfs2_holder i_rgd_gh;